Ventilator



- May 2, 1944-. EVANS 2,347,895

VENTILATOR Filed Feb. 9, 1942 Patented May 2, 1944 UNITED STATES PATENT OFFICE H YENTILATOR RhysEvana Lon don, England Application February 9, 1942, Serial No. 430,125 I In'Great; Brit'ain May 27, 1941 r 2 Claims. 01. 98-37) This invention relates to improvements in ven' tilator and has for its .object to provide a 'ven: tilat'or, more particularly for ships portholes and factories which, whilst allowing an air flow ape proximating to that given byan unobstructed porthole or like aperture, will, at the same time; eifectively prevent the egress of light through the porthole or other aperture.

The ventilator according to the present invention comprises essentially a tubular casing adapted to fit snugly in the porthole or other aperture, said casing being provided with a transverse web which is opaque, with the exception of an aperture which is masked by a spaced plate,

so that, Whilst an inflow and/or outflow of air more than one-half of the surface of the casing but not completely over the said surfaces so that registering air spaces are provided, a similar, but oppositely disposed, screen being interposed between the front and back screens so as effectively to prevent the egress 'of light.

In order still further to increase the efilciency of this preferred embodiment, a hood in the form of a part of a sphere may be provided over the back aperture.

Certain other novel features of construction and arrangement are provided by the present invention, these being fully described hereinafter and claimed in the appended claims. I

In order that this invention may be the more clearly understood and readily carried into effect, I will proceed to describe the same with reference to the accompanying drawing, which illustrates by way of example and not of limitation certain convenient embodiments of this invention, and in which:

Figure 1 is a perspective view of one form of black-out ventilator according to the present invention adapted for use in a ventilator, and

Figure 2 is a central vertical section through the same.

Figure 3 is a, perspective view of a modified and preferred embodiment of the present invention, and

Figure 4 is a central vertical section through the same.

illustrating one method of securing the black-out ventilator in-position in the porthole.

Referring now to the drawing, and more particularly to Figures 1 and 2 thereof, the blackout ventilator therein illustrated is adapted for use with ships portholes and comprises a tubular outer casing H] which is a snug fit in the porthole (not shown), and is adapted to be secured therein by means of outstanding ears H which are slotted as at l2 to receive the usual porthole securing bolts shown in broken lines at l3.

Transversely disposed across the outer'casing l is a metal sheet l4 forming an opaque web, a with the xception of a central aperture [5 of the desired size. This aperture I5 is covered by a circular metal masking plate [6 which is spaced away from the web 14 by means of spacing sleeves IT. The masking plat 16 is also provided with a central aperture I8 which, in turn, is

masked by a further masking plate I9 of larger. diameter than the aperture I8 and spaced from the plate I6 by spacing sleeves I'l. This arrangement ofapertured plates and masking discs or sheets may be continued toany degree considered necessary in order to'give the desired air flow; In all cases the apertures and masking plates may be provided with oppositely directed upstanding and peripheral flanges 20 and 2| respectively, these flanges, at one or more stages, preferably overlapping one another in their planar disposition so as to avoid all possibility of the egress of light.

Referring now to the modified construction illustrated in Figures 3 to 5 of the accompanying drawing, thi embodiment has been found to be preferable in many cases to that illustrated in Figures 1 and 2, and comprises the tubular casing 10, as in the previously described construction. The casing in this embodiment of the present invention is provided with inner or front and outer or back opaque screens 30 and 3| respectively which extend above the horizontal diameter but not to the top of the device so that air spaces 32 are provided. The screens 30 and 3| thus cover more than one-half of the surface of the casing but not the whole of the same. A similar, but oppositely disposed intermediate, screen 33 is disposed between the front and back screens 30 and 3| so as effectively to prevent the egress of light and, if desired, a hood 34 in the form of a part of a sphere may be provided over the back aperture further to increase the efficiency of the device.

A further feature of the present invention is Figure 5 is a detail horizontal sectional view, the provision of very simple and effective means for securing the preferred form of black-out ventilator according to the present invention in position in the porthole. To this end, two or more securing bolts 40 are provided passing freely through suitable holes 4| in the casing H] (see more particularly Figure 5), and are provided at their outer ends with outstanding arms 42. In order to mount the complete device in position, the securing bolts 40 are turned so that the outstanding arms 42 lie within'the perimeter of the casing (see the broken line position in Figure 5 and the device is then placedin position in the porthole. then turned so that the outstanding arms 42 project beyond the perimeter of thetporthole on the outside of the same and are tightened up to clamp the device in position by means. of.

wing nuts 44. on their inner threaded'ends' The securing bolts 48 are The outer ends of the outstanding arms 42 are conveniently turned back upon themselves as at 42" to give'a satisfactory bearing'surface i and, i order to facilitate the turning of the bolts lll, as above described, the innerends of the bolts 40 may be provided with arms 50 similarly disposed radially to the outerarms "42. This will serve not onlyto facilitate the operation of the securing bolts but will alsoserve as indication of the position of the outstanding arms 42 ;on the outside of the porthole, as will readily be understood.

Although the present invention is more par-v ticularly intended for use as a porthole blackout ventilator, it will be obvious that it is also applicable to black-out ventilators for other apertures.

I claim: 7

1. A ventilator for insertion into port holes, windows and like wall openings, comprising, an

annular frame including inner and outer cylin-' drical sections, the latter being of smaller diameter than the former and connected by an inter mediate section of arcuate cross section, an annular offset flange carried by and of greater diameter than said inner section which acts as an abutment when the ventilator frame is inits free edge disposed between and in spaced overlapping relation with the free edges of the first mentioned screens, and a hood of arcuate cross section having its base connected to the 1 upper side of the outer section of the frame opposite the outer screen and having its open end terminating at a plane disposed below the free edge of said outer screen thereby to overlap the said outer screen and 'shield the opening in the outer; section of the frame.

2. A ventilator according to claim 1 wherein a clamping device is provided to permit lock-' ing the ventilator frame in the wall opening from the room side thereof, said device including a bolt having a shank piercing the wall of the inner opaque screen and the arcuate intermediate section and also having threads on its inner portion, a wing-nut onsaid threads, projecting arms at the inner and outer extremities of said bolt shank and offset in a common radial I a plane, whereby the position of the inner arm will indicate when the outer arm is in position to engage the outer face of the wall opening so that the base of the wing-nut may be rotated on the shank into bearing engagement with the inner' opaque screen 'to move the bolt shank and pull the outer arm in gripping engagement with the outer face of the wall opening while also drawing the said flange on the inner section against the inner face of the wall opening to rigidly clamp the frame in said opening, j Y

f RHYS EVANS. 

